The adventure begins with a school girl named Eri getting magically summoned to a magical world. Eri has been summoned by a magician named Rex, intent on doing some scientific research observing people from different worlds. Rex is cute, with long dark hair and a rather pained expression at the trials Eri puts him through. Eri is not your average school girl. Instead of being terrified about her current situation, she manages to secure Rexâ€™s promise to summon her again every week. Well OK, so the promise was rather reluctantly given due to a sneaky trick Eri plays involving the alarm on her digital watch. After all, being in a magical world is a lot more exciting than life as a school girl. The manga series chronicles Eriâ€™s adventures in this magical world, as she travels around with Rex and the Prince of that world, a rather bishounen blond named Krueger. Unfortunately for Rex and Krueger, it is somewhat difficult to keep up with the very pushy Eri, and she manages to get them into quite a bit of mischief.